deletions | additions       diff --git a/EM sensor array.tex b/EM sensor array.tex  index bd6b8d4..48596e1 100644  --- a/EM sensor array.tex  +++ b/EM sensor array.tex 
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Stepper motors were selected so that the vertical travel of the sensor array could be precisely controlled through the microcontroller.  At each of the four corners of the sensor array, an eye hook was attached.  A single piece of 10-pound test fishing connected to one eye hook,   led up through another eye hook attached to the frame, through a hole in the spool, and continued symmetrically on the other side. side (see Figure \ref{stepper_mechanism}).  Through this mechanism the sensor array was lifted without twisting from four points.  The high gear ratio of the gearboxes attached to the stepper motors (9:1)  meant that the sensor array stayed in the raised position without any power being supplied to the stepper motors.